CN202878629U - Control system of injection molding machine - Google Patents
Control system of injection molding machine Download PDFInfo
- Publication number
- CN202878629U CN202878629U CN 201220118080 CN201220118080U CN202878629U CN 202878629 U CN202878629 U CN 202878629U CN 201220118080 CN201220118080 CN 201220118080 CN 201220118080 U CN201220118080 U CN 201220118080U CN 202878629 U CN202878629 U CN 202878629U
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- servo
- driver
- pressure
- injection molding
- servo driver
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Abstract
The utility model discloses a control system of an injection molding machine. The control system of the injection molding machine comprises an injection molding machine controller, a servo driver, a servo motor, a quantitative oil pump for supplying pressure for a hydraulic system, pressure sensors and a rotation speed sensor, wherein the injection molding machine controller is connected with the servo driver, and sends motion instructions to the servo driver; the servo driver is connected with the servo motor, and controls the motor to operate; the motor is connected with the oil pump for driving the oil pump to operate; the pressure sensors are installed on an oil circuit required to be detected; the rotation speed sensor is installed in the servo motor; a digital communication protocol is established between the injection molding machine controller and the servo driver, and sends motion instructions to the servo driver in a digital communication mode; information sent to the servo driver by the injection molding controller comprises a pressure control signal, a flow rate control signal and a servo driver response speed control signal; one end of each pressure sensor in a plurality of pressure sensors is connected with the required detection point, and the other end of each pressure sensor in the plurality of pressure sensors is connected with the servo driver so as to form a plurality of pressure sensor signal feedback systems; and the pressure sensors and the rotation speed sensor are directly connected with the servo driver so as to achieve automatic pressure and flow rate regulation.
Description
Technical field
The utility model relates to a kind of injection machine field, relates in particular to a kind of control system of injection machine.
Background technology
Carry out the analog quantity communication in the prior art between controller of plastic injection molding and the servo-driver, by pressure, the flow indication of controller of plastic injection molding to the action of servo-driver distribution of machine.According to the indication that controller of plastic injection molding provides, servo-driver can only provide a fixing response speed.
But there is following shortcoming in prior art:
(1) controller of plastic injection molding sends analog signals to servo-drive and controls, because analog signals unstable or be interfered easily, so cause easily the unstable of injection machine operation, repeatable accuracy is poor.
(2) information sent to servo-driver of controller of plastic injection molding only has two kinds: pressure controling signal and flow control signal, because not to the control signal of actuator response speed, so in whole injection machine operation control, all be to move according to identical actuator response speed, the needed pressure of the everything of injection machine, flow all go to carry out according to this response speed like this.It is not identical that but each moves needed response speed, like this with regard to having produced a problem, if that is: response speed tunes up, so when the action operation that does not need fast response, just produce easily the vibrations of hydraulic shock and motor, cause service life of a machine to be affected; If response speed slows down, the action that can cause again the requirement ask for something to respond fast can not be accomplished good effect, has reduced the performance of machine, has also wasted the highly-responsive of servo-drive system.
Summary of the invention
The purpose of this utility model is in order to solve the existing technical problem of aforementioned injection machine, and the application provides a kind of new control system for shot machine and control method.
The utility model is to be achieved through the following technical solutions above-mentioned purpose:
A kind of control system of injection machine comprises:
Controller of plastic injection molding, servo-driver, servomotor, provide the quantitative oil pump of pressure, pressure sensor, speed probe to hydraulic system, wherein controller of plastic injection molding links to each other with servo-driver, send action command to servo-driver, servo-driver links to each other with servomotor, the control motor rotation, motor links to each other with oil pump, in order to drive the oil pump running, pressure sensor is installed on the oil circuit that needs to detect, and speed probe is installed in the servomotor;
Described servo-driver comprises: the pressure control module, be used for the pressure controlling value according to injection stage or folding mode step section, and when force value and the pressure controlling value of the pressure sensor that collects have difference, the output valve of adjusting pressure signal; Flow-control module is used for the flow-control value according to injection stage or folding mode step section, when flow value corresponding to the rotating speed of the speed probe that collects and flow-control value have difference, and the output valve of adjust flux signal; The torque drive unit is used for pressure signal is converted to the moment of torsion control signal; The rotating speed driver element is used for converting flow signal to tach signal;
Set up the digital communication agreement between controller of plastic injection molding and the servo-driver, adopt the digital communication mode to send action command to servo-driver; The information that controller of plastic injection molding sends to servo-driver has pressure controling signal, flow control signal and servo-driver response speed control signal; A plurality of pressure sensors, an end of each pressure sensor links to each other with required test point, and the other end directly links to each other with servo-driver, forms a plurality of pressure sensor signal feedback system; Pressure sensor is regulated automatically with the direct realization pressure that is connected with servo-driver of speed probe, flow.
Described servomotor is permanent magnet synchronous servo motor.
Described permanent magnet synchronous servo motor is connected with the direct axle of oil pump, oil pump adopts gear pump, and the permanent magnet synchronous servo motor axle adopts internal spline, and gear pump shaft adopts external splines, described spline adopts that the displacement number of teeth is 0.8, pressure angle is 20 ° involute spline, and inside and outside spline directly connects.
A kind of aforementioned described control system for shot machine control injection machine injection and folding method of module of utilizing, comprise: controller of plastic injection molding is according to action of injection processing parameter setting value, by with the digital communication agreement of servo-driver, send action command to servo-driver, be flow, pressure and quick response instruction, servo-driver is commanded the rotating speed of servomotor according to the flow instruction of receiving, limit the torque of servomotor according to pressure instruction, according to the quick response instruction of action of injection needs, realize the height response of action of injection, high performance characteristics; The servo motor driven oil pump running, export corresponding hydraulic fluid flow rate and pressure, enter in the injection cylinder, promote injection mechanism and finish action of injection, in this course, a pressure sensor feeds back to servo-driver with actual oily force value, and servo-driver sends instruction according to the numerical value real-time operation correction of feedback, to guarantee that actual act and demand for control are consistent, and have formed the injection closed-loop system;
When carrying out the action of folding mould, controller of plastic injection molding is according to folding mould action processing parameter setting value, by with the digital communication agreement of servo-driver, send action command to servo-driver, be flow, pressure and medium speed's response instruction, servo-driver is commanded the rotating speed of servomotor according to the flow instruction of receiving, limit the torque of servomotor according to pressure instruction, medium speed's response instruction according to folding mould action needs, realize that the folding mould moves medium response speed, stress the characteristics of stationarity; The servo motor driven oil pump running; export corresponding hydraulic fluid flow rate and pressure; enter in the folding mould oil cylinder; promote clasp mould mechanism and finish the action of folding mould; in this course, another pressure sensor feeds back to servo-driver with the force value of actual oil, and servo-driver sends instruction according to the numerical value real-time operation correction of feedback; to guarantee that actual act and demand for control are consistent, realized an independent folding mould closed-loop system different from the injection closed-loop control.
The utility model realizes that the servo-controlled mode of digital substep is fully different from prior art, is mainly reflected in:
(1) communication modes.Traditional technology is to send the voltage and current analog signals by controller of plastic injection molding to servo-driver, and driver carries out execution action according to this signal; In the utility model, what communication was adopted is to send digital quantity signal by controller of plastic injection molding to servo-driver by communications protocol, and driver carries out execution action according to data signal, has improved the Stability and veracity of execution action.
(2) response speed control data have been increased.Technology in the past, the information that controller of plastic injection molding sends to servo-driver only have two kinds: pressure controling signal and flow control signal; In the utility model, controller of plastic injection molding not only has pressure controling signal and flow control signal to the information that servo-driver sends, also increased servo-driver response speed control signal, when injection machine is done different action, the response speed that servo-driver can provide according to controller of plastic injection molding requires or action response carries out control to servomotor, and the purpose that provides respective response speed to regulate for each minute action has been provided.This so that the ability of the servo high response of injection machine give full play to, the overall performance Effective Raise, move more steady, effect such as raising such as complex optimum such as prolongations in service life grade.
Response speed control can adopt known frequency converter to realize.Further, the present invention provides wherein a kind of concrete frequency converter connected mode.Be that the controller of plastic injection molding control system links to each other with frequency converter, frequency converter links to each other with servo-driver (frequency converter also can be built in the servo-driver and directly link to each other with motor), and servo-driver comes drive motors work.Motor is not quite identical in the running frequency pace of change of different process section, also be that the operation response speed that the different process section requires is different, controller of plastic injection molding is according to different response speed requirements, (frequency converter can calculate corresponding frequency control signal value and motor shifts to an earlier date the speed change time point according to input control signal to output response speed control signal, also can control signal be converted into the frequency control signal value in advance and motor shifts to an earlier date the speed change time point by controller of plastic injection molding, then sending frequency converter to controls) to the frequency converter that links to each other with servo-driver, control the running of motor to the operation response speed control signal of servo-driver transmission motor by frequency converter, realize different speed responsive requirements, reach the energy-conservation or extension device purpose in service life.
(3) pressure closed loop feeds back signal to servo-driver.Servo-driver carries out calculation process according to this signal, adjusts the motion of motor, has realized the integral body control of injection machine, better finishes the control of injection machine overall operation.
(4) a plurality of pressure signal acquisition processing systems have been increased.In the technology in the past, the signal of pressure sensor sends to servo-driver, so servo-driver can only pressure signal control system of reception ﹠ disposal can not be expanded the more high-precision a plurality of pressure sensor signal feedback processing systems of realization, has retrained the raising of injection machine performance.In the utility model, the signal of a plurality of pressure sensors can be sent to servo-driver, servo-driver can carry out calculation process according to each pressure sensor signal, reaches the accurate control to each pressure detecting point.Adopt the method for this patent, can increase substantially the servo-controlled precision of injection machine, and provide the basic controlling system for multi-functional expansion.
Description of drawings:
Fig. 1: injection machine hierarchy of control schematic diagram described in the utility model.
Description of reference numerals:
The 1-controller of plastic injection molding, 2-servo-driver, 3-servomotor, 4-oil pump, 5-pressure sensor (survey injection pressure), 6-pressure sensor (surveying the folding molding pressure), 7-speed probe.
The specific embodiment
Below in conjunction with specific embodiment the utility model has been done further description.
Injection machine is by man-machine interface---and controller of plastic injection molding carries out the instruction control of everything.Injection machine action control process is basic identical, by injection, folding mould, eject, plastify, the seat advance and retreat have formed everything, wherein main action is injection and folding mould, these two actions have the greatest impact to machine performance.
As described in Figure 1, a kind of control system for shot machine, comprise controller of plastic injection molding 1, servo-driver 2, servomotor 3 provides the quantitative oil pump 4 of pressure to hydraulic system, pressure sensor (5,6), speed probe 7, wherein controller of plastic injection molding 1 links to each other with servo-driver 2, send action command to servo-driver 2, servo-driver 2 links to each other with servomotor 3,3 runnings of control motor, and motor 3 links to each other with oil pump 4, in order to drive oil pump 4 runnings, pressure sensor (5,6) is installed on the oil circuit that needs to detect, and speed probe 7 is installed in the servomotor 3; Described servo-driver 2 comprises: the pressure control module, be used for the pressure controlling value according to the work at present stage, and when force value and the pressure controlling value of the pressure sensor that collects have difference, the output valve of adjusting pressure signal; Flow-control module is used for the flow-control value according to the work at present stage, and when flow value corresponding to the rotating speed of the speed probe that collects had difference with the flow-control value, adjusting stream was the output valve of signal; The torque drive unit is used for pressure signal is converted to the moment of torsion control signal; The rotating speed driver element is used for converting flow signal to tach signal; Set up the digital communication agreement 1. between controller of plastic injection molding 1 and the servo-driver 2, adopt the digital communication mode to send action command to servo-driver; Controller of plastic injection molding not only has pressure controling signal and flow control signal to the information that servo-driver sends, and has also increased servo-driver response speed control signal 3.; A plurality of pressure sensors (5,6), an end of each pressure sensor links to each other with required test point, and the other end directly links to each other with servo-driver 2, forms a plurality of pressure sensor signal feedback system; Pressure sensor (5,6) is regulated automatically with the speed probe 7 direct realization pressure that are connected with servo-driver 2, flow.
Further, for detection of the pressure in when injection 2. described a plurality of pressure sensors (5,6) wherein have one, also have the pressure when detecting the folding mould 4..
Further, to take motor be that the permanent-magnet synchronous private takes motor in described private.Particularly, described permanent-magnet synchronous private takes motor and is connected with the direct axle of oil pump, oil pump adopts gear pump, the permanent-magnet synchronous private takes motor shaft and adopts internal spline, gear pump shaft adopts external splines, described spline adopts that the displacement number of teeth is 0.8, pressure angle is 20 ° involute spline, and inside and outside spline directly connects.What connect like this is better, more steady.Above-mentioned axle connection also can be adopted other forms of spline joint, and connection is connected with gear.
Again further, described motor is not selected servomotor, and selects stepper motor.
The operating process of concrete injection and folding mould is: controller of plastic injection molding 1 is according to action of injection processing parameter setting value, by with 1. agreement of the digital communication of servo-driver 2, send action command to servo-driver 2, be voltage (flow), electric current (pressure) and quick response instruction are 3., servo-driver 2 is commanded the rotating speed of servomotor 3 according to voltage (flow) instruction of receiving, instruction limits the torque of servomotor 3 according to electric current (pressure), according to the quick response instruction of action of injection needs, realize the height response of action of injection, high performance characteristics.Servomotor 3 drives oil pump 4 runnings, export corresponding hydraulic fluid flow rate and pressure, enter in the injection cylinder, promote injection mechanism and finish action of injection, in this course, 2. pressure sensor 5 feeds back to servo-driver 2 with the force value of actual oil, 5. speed probe 7 feeds back to servo-driver 2 with the motor speed value (flow) of reality, send instruction after the numerical value real-time operation correction of servo-driver 2 according to feedback, to guarantee that actual act and demand for control are consistent, and have formed the injection closed-loop system.
When carrying out the action of folding mould, controller of plastic injection molding 1 is according to folding mould action processing parameter setting value, by with 1. agreement of the digital communication of servo-driver, send action command to servo-driver 2, be voltage (flow), electric current (pressure) and medium speed's response instruction are 3., servo-driver 2 is commanded the rotating speed of servomotor according to voltage (flow) instruction of receiving, instruction limits the torque of servomotor 3 according to electric current (pressure), medium speed's response instruction according to folding mould action needs, realize that the folding mould moves medium response speed, stress the characteristics of stationarity.Servomotor 3 drives oil pump 4 runnings; export corresponding hydraulic fluid flow rate and pressure; enter in the folding mould oil cylinder; promote clasp mould mechanism and finish the action of folding mould; in this course, 4. pressure sensor 6 feeds back to servo-driver 2 with the force value of actual oil, and 5. speed probe 7 feeds back to servo-driver 2 with the motor speed value of reality; send instruction after the numerical value real-time operation correction of servo-driver 2 according to feedback, be consistent to guarantee actual act and demand for control.Realized an independent folding mould closed-loop system different from the injection closed-loop control.
By being moved, difference carries out the control 3. of friction speed response instruction, in conjunction with attainable closed-loop system, and the performance of Effective Raise machine, stationarity and control accuracy.
Maximum bright spot of the present utility model is:
(1) servo-driver is adjusted action control speed according to the response speed control signal, optimizes the overall operation of injection machine.
(2) reduce the interference of communication, improved data transmission credibility.
(3) realize the whole closed loop of injection machine, improved the precision of motion control.
(4) a plurality of pressure signal acquisition process have further improved the running precision of injector.
Certainly; the above only is a kind of embodiment of the present utility model; should be understood that those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications all belong within the protection domain of the utility model claim.
Claims (1)
1. the control system of an injection machine comprises:
Controller of plastic injection molding, servo-driver, servomotor, provide the quantitative oil pump of pressure, pressure sensor, speed probe to hydraulic system, wherein controller of plastic injection molding links to each other with servo-driver, send action command to servo-driver, servo-driver links to each other with servomotor, the control motor rotation, motor links to each other with oil pump, in order to drive the oil pump running, pressure sensor is installed on the oil circuit that needs to detect, and speed probe is installed in the servomotor;
Described servomotor is permanent magnet synchronous servo motor; This permanent magnet synchronous servo motor is connected with the direct axle of oil pump, oil pump adopts gear pump, and the permanent magnet synchronous servo motor axle adopts internal spline, and gear pump shaft adopts external splines, described spline adopts that the displacement number of teeth is 0.8, pressure angle is 20 ° involute spline, and inside and outside spline directly connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220118080 CN202878629U (en) | 2012-03-27 | 2012-03-27 | Control system of injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220118080 CN202878629U (en) | 2012-03-27 | 2012-03-27 | Control system of injection molding machine |
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| Publication Number | Publication Date |
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| CN202878629U true CN202878629U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220118080 Expired - Fee Related CN202878629U (en) | 2012-03-27 | 2012-03-27 | Control system of injection molding machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108571495A (en) * | 2018-07-17 | 2018-09-25 | 珠海汇智智能装备有限公司 | Handset in servo |
| CN108571494A (en) * | 2018-07-17 | 2018-09-25 | 珠海汇智智能装备有限公司 | Hydraulic neutron machine |
-
2012
- 2012-03-27 CN CN 201220118080 patent/CN202878629U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108571495A (en) * | 2018-07-17 | 2018-09-25 | 珠海汇智智能装备有限公司 | Handset in servo |
| CN108571494A (en) * | 2018-07-17 | 2018-09-25 | 珠海汇智智能装备有限公司 | Hydraulic neutron machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Ningbo Ongreat Electromechanical Technology Co., Ltd. Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20140327 |